This report employed molecular statics simulation and density-functional-theory calculation to study the Poisson's ratios of face-centered-cubic materials. We provide numerical and theoretical evidences to show that cubic materials can exhibit auxetic behavior in a principal direction under proper loading conditions. When a stress perpendicular to the loading direction is applied, cubic materials can exhibit a negative Poisson's ratio at finite strain. The negative Poisson's ratio behavior, including its direction and value, is highly dependent on the direction and magnitude of the transversely applied stresses. As a result, we show that it is possible to tune the direction and magnitude of the negative Poisson's ratio behavior of cubic materials by controlling the transverse loadings.
Bibliographical noteFunding Information:
We gratefully acknowledge the support from the ICT R&D Program (no. R0190-15-2012) of Institute for Information communications Technology Promotion (IITP) and from the Mid-Career Researcher Support Program (grant no. 2014R1A2A2A09052374) of the National Research Foundation (NRF), which are funded by the MSIP of Korea. We also acknowledge with gratitude the support from the 2015 Research Fund (1.150033.01) of UNIST and the PLSI supercomputing resources of the KISTI and the UNIST Supercomputing Center.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics